Light emitting device
AssigneeNichia Corporation
InventorKenji ASAI
Life of this patent
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Abstract
A light emitting device that is capable of achieving excellent color rendering property is provided. The light emitting device contains a light emitting element having a light emission peak wavelength within a range of 430 nm or more and 470 nm or less, and a fluorescent member. The fluorescent member contains a first fluorescent material that contains an Eu-activated alkaline earth aluminate, a second fluorescent material that contains a Mn-activated fluorogermanate, a third fluorescent material that contains a Ce-activated rare earth aluminate, and a fourth fluorescent material that contains an Eu-activated silicon nitride having Al and at least one of Sr and Ca.
Claims21
A light emitting device comprising:
- a light emitting element having a light emission peak wavelength within a range of 430 nm or more and 470 nm or less, and
- a fluorescent member, wherein
- the light emitting device emitting light has a correlated color temperature in a range of 3,500 K or more and 4,500 K or less, and
- the fluorescent member comprises:
- a first fluorescent material that contains an Eu-activated alkaline earth aluminate,
- a second fluorescent material that contains a Mn-activated fluorogermanate,
- a third fluorescent material that contains a Ce-activated rare earth aluminate, and
- a fourth fluorescent material that contains an Eu-activated silicon nitride having Al and at least one of Sr and Ca, wherein
- the first fluorescent material has a content ratio in a range of 3.0% by mass or more and 55.0% by mass or less based on a total fluorescent material amount.
A light emitting device comprising:
- a light emitting element having a light emission peak wavelength within a range of 430 nm or more and 470 nm or less, and
- a fluorescent member, wherein
- the light emitting device emitting light has a correlated color temperature in a range of 4,500 K or more and 5,500 K or less, and
- the fluorescent member comprises:
- a first fluorescent material that contains an Eu-activated alkaline earth aluminate,
- a second fluorescent material that contains a Mn-activated fluorogermanate,
- a third fluorescent material that contains a Ce-activated rare earth aluminate, and
- a fourth fluorescent material that contains an Eu-activated silicon nitride having Al and at least one of Sr and Ca, wherein
- the first fluorescent material having a content ratio in a range of 3.5% by mass or more and 65.0% by mass or less based on a total fluorescent material amount.
A light emitting device comprising:
- a light emitting element having a light emission peak wavelength within a range of 430 nm or more and 470 nm or less, and
- a fluorescent member, wherein
- the light emitting device emitting light has a correlated color temperature in a range of 5,500 K or more and 7,000 K or less, and
- the fluorescent member comprises:
- a first fluorescent material that contains an Eu-activated alkaline earth aluminate,
- a second fluorescent material that contains a Mn-activated fluorogermanate,
- a third fluorescent material that contains a Ce-activated rare earth aluminate, and
- a fourth fluorescent material that contains an Eu-activated silicon nitride having Al and at least one of Sr and Ca, wherein
- the first fluorescent material having a content ratio in a range of 7.5% by mass or more and 55.0% by mass or less based on a total fluorescent material amount.
Dependencies are inferred from the claim text.